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A toroidal propeller is a type of propeller that is ring-shaped with each blade forming a closed loop. The propellers are significantly quieter at audible frequency ranges, between 20 Hz and 20 kHz, while generating comparable thrust to traditional propellers. In practice, toroidal propellers reduce noise pollution in both aviation and maritime ...
Haw Propeller - Germany; Helices E-PROPS - Electravia - France (2008–present) Hélices Halter - France (1987-2014) Hamilton Standard - United States (1929-1999) Hamilton Sundstrand - United States (1999-2012) Hartzell Propeller - United States (1917–present) Hegy Propellers - United States; Heine Propellers - Germany; Helix-Carbon - Germany ...
Hartzell introduced a turboprop propeller in 1961 and, in 1975, certified a 5-bladed propeller for the Short 330. [9] [12] In 1978, the company produced a composite aramid fiber propeller for the CASA 212. [13] In 1989, Hartzell produced sixteen-foot propellers for the Boeing Condor, another record-breaking aircraft. [11]
Bernie Warnke Propellers, founded by Bernie Warnke, is an American manufacturer of wooden propellers for homebuilt and aerobatic aircraft. The company headquarters is located in Tucson, Arizona. [1] Warnke makes propellers for engines up to 260 hp (194 kW) from maple laminates. [1]
Whirl Wind Propellers Corporation, is an American manufacturer of composite propellers for homebuilt and light-sport aircraft. The company headquarters is located in Piqua Ohio. [1] The company makes composite ground adjustable aircraft propellers as well as replacement blades for the Nanchang CJ-6's V530 propeller and also airboat propellers ...
MT-Propeller Entwicklung GmbH, founded in 1980 by Gerd Muehlbauer, is a manufacturer of composite propellers for single and twin engine aircraft, airships, wind tunnels and other special applications. [1] [2] [3] The company headquarters is located at Straubing Wallmuhle Airport in Bavaria, Germany. [3]